<template>
   <div class="login_container">
    <div class="login_box">
        <!-- 头像区域 -->
        <div class="avatar_box">
            <img src="../assets/logo.png" alt="">
        </div>
        <!-- 登录表单区域 -->
        <el-form ref="loginFormRef" :model="login_form" :rules="loginFormRules" label-width="0px" class="login_form">
            <!-- 用户名 -->
            <el-form-item prop="username">
                <el-input prefix-icon="el-icon-user" v-model="login_form.username"></el-input>
            </el-form-item>
            <!-- 密码 -->
            <el-form-item prop="password">
                <el-input prefix-icon="el-icon-lock" v-model="login_form.password" show-password></el-input>
            </el-form-item>
            <!-- 按钮区域 -->
            <el-form-item class="btns">
                <el-button type="primary" @click="login">登录</el-button>
                <el-button type="info" @click="resetloginForm">重置</el-button>
            </el-form-item>
        </el-form>
    </div>
   </div>
</template>

<script>
export default {
    data(){
        return{
            // 这是登录数据表单的数据对象
            login_form:{
                username: 'admin',
                password: '123456'
            },
            //这是表单的验证规则对象
            loginFormRules:{
                //验证用户名是否合法
                username : [
                    { required: true, message: '请输登录名称', trigger: 'blur' },
                    { min: 3, max: 8, message: '长度在 3 到 8 个字符', trigger: 'blur' }
                ],
                //验证密码是否合法
                password : [
                    { required: true, message: '请输登录密码', trigger: 'blur' },
                    { min: 6, max: 12, message: '长度在 6 到 12 个字符', trigger: 'blur' }
                ],
            }
        }
    },
    methods:{
        //点击重置按钮，重置登录表单
        resetloginForm(){
            this.$refs.loginFormRef.resetFields();
        },
        login(){
           this.$refs.loginFormRef.validate(async valid => {
                if(!valid) return ;
                const {data : res} =await this.$http.post('login',this.login_form);
                if(res.meta.status !== 200) return this.$message.error('登录失败');;
                this.$message.success('登录成功');
                window.sessionStorage.setItem('token',res.data.token);
                this.$router.push('/home');
            })
        }
    }
}
</script>

<style  lang="less" scoped>
    .login_container{
        background: url('https://w.wallhaven.cc/full/9m/wallhaven-9mjoy1.png');
        height: 100%;
        width: 100%;
        background-attachment: fixed;
        background-size: cover;
    }
    .login_box{  
        width: 500px;
        height: 330px;
        background-color: #fff;
        border-radius: 3px;
        position: absolute;
        left: 50%;
        top: 50%;
        transform: translate(-50%,-50%);
        .avatar_box{
            height: 130px;
            width: 130px;
            border: 1px solid #eee;
            border-radius: 50%;
            padding: 10px;
            box-shadow: 0 0 10px #ddd;
            position: absolute;
            left: 50%;
            transform: translate(-50%,-50%);
            background-color: #fff;
            img{
                width: 100%;
                height: 100%;
                border-radius: 50%;
                background-color: #eee;
            }
        }
    }
    .btns{
        display: flex;
        justify-content: flex-end;
    }
    .login_form{
        position: absolute;
        bottom: 0;
        width: 100%;
        padding: 0  20px;
        box-sizing: border-box;
    }
</style>
